You just got the "application is ready for sale!" email from Apple. Now what?
First off, log into iTunes Connect and go to the Manage Your Applications area. Edit the info on your new app, select the Pricing tab, and change the release date to today. This will cause your app to show up at the top of the new releases in its category, instead of buried 10 pages down.
If you've built a web page for your app, you'll want to add links so people can order it. The iTunes URL will be something like this:
Replace YOURAPPID with the Application Apple ID number you got in the "Ready for Sale" email.
Now you should promote your app!